ci: add Swoole extension to GitHub Actions setup

Author: mmalac

.github/workflows/continuous-integration.yml

@@ -21,6 +21,7 @@ jobs:
       - uses: shivammathur/[email protected]
         with:
           php-version: ${{ env.default_php }}
+          extensions: swoole
           tools: composer
       - uses: ramsey/composer-install@v3
       - run: composer rector